diff --git a/.circleci/config.yml b/.circleci/config.yml
index 6982031..dd759cf 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -27,6 +27,7 @@ workflows:
           matrix:
             parameters:
               image:
+                - cimg/node:16.20
                 - cimg/node:18.19
                 - cimg/node:lts
                 - cimg/node:current
@@ -102,7 +103,7 @@ jobs:
       - run: node -v
       - attach_workspace:
           at: .
-      - run: npm t
+      - run: npm t -- spec
   publish:
     working_directory: ~/project
     docker:
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 9d621ef..9c31f3b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## [4.0.1](https://github.com/omrilotan/isbot/compare/v4.0.0...v4.0.1)
+
+- Pattern optimisation (performance improvement)
+
 ## [4.0.0](https://github.com/omrilotan/isbot/compare/v3.7.1...v4.0.0)
 
 ### Breaking changes
diff --git a/fixtures/browsers.yml b/fixtures/browsers.yml
index da39e85..25712b6 100644
--- a/fixtures/browsers.yml
+++ b/fixtures/browsers.yml
@@ -45,8 +45,9 @@ AOL:
   - Mozilla/4.0 (compatible; MSIE 6.0; AOL 9.0; Windows NT 5.1; SV1; .NET CLR 1.1.4322)
   - Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 ADG/11.0.2566 AOLBUILD/11.0.2566 Safari/537.36
 Apple TV:
-  - AppleTV5,3/9.1.1
-  - AppleTV6,2/11.1
+  - AppName/1 CFNetwork/758.1.2 Darwin/15.0.0
+  - AppName/1 CFNetwork/758.1.3 AppleTV/16.0.0
+  - Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) AppleWebKit/604.1.38 (KHTML, like Gecko) Mobile/15J380
 Arora:
   - "Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en-US) AppleWebKit/532.1 (KHTML, like Gecko) Arora/0.10.1 (Git: 1329 e5385f3) Safari/532.1"
   - Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en-US) AppleWebKit/533.3 (KHTML, like Gecko) Arora/0.11.0 Safari/533.3
@@ -478,7 +479,6 @@ QtWebEngine:
 QuickTime:
   - QuickTime/7.6.6 (qtver=7.6.6;cpu=IA32;os=Mac 10.6.8)
 RadiosNet:
-  - Lavf/57.83.100, RadiosNet/2.6.2 (Java; Android)
   - RadiosNet/2.1.1 (Java; Android)
   - RadiosNet/2.2.1 (Java; Android)
   - RadiosNet/2.2.3 (Java; Android)
@@ -675,9 +675,7 @@ ZZZ Glitches and Misidentified Browsers - These browsers are legit user agent ev
   - ; Android 11) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/96.0.4664.45 Mobile DuckDuckGo/5 Safari/537.36
   - Android 11) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/86.0.4240.185 Mobile DuckDuckGo/5 Safari/537.36
   - Android 13) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/114.0.5735.196 Mobile DuckDuckGo/5 Safari/537.36
-  - daumoa,damoa,daum,daumos,duamoa,duam,duamos
   - GoogleApp/14.35.18.28.arm64
-  - Hello, world
   - LWPrCa2l') OR 941=(SELECT 941 FROM PG_SLEEP(15))--
   - Mozilla / 5.0 (Linux; Android 7.0; GHIA_ZEUS_3G) AppleWebKit / 537.36 (KHTML, como Gecko) Chrome / 87.0.4280.101 Mobile Safari / 537.36
   - Mozilla/5.0 (compatible; Lucidworks-Anda/2.0/0.10; +; )
diff --git a/package.json b/package.json
index 9cc5bf4..5d9a185 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "isbot",
-  "version": "4.0.0",
+  "version": "4.0.1",
   "description": "🤖 Recognise bots/crawlers/spiders using the user agent string.",
   "keywords": [
     "bot",
diff --git a/scripts/prepare/build/index.js b/scripts/prepare/build/index.js
index 9e3038e..e9ade0a 100644
--- a/scripts/prepare/build/index.js
+++ b/scripts/prepare/build/index.js
@@ -57,12 +57,15 @@ async function crawlers({ fixturesDirectory, downloadsDirectory }) {
 			// Ignore
 		}
 	}
-	return crawlers
-		.concat(downloaded.flat())
-		.filter((ua) => !ua.startsWith("#")) // Remove comments
-		.filter(
-			(ua = "") => !/ucweb|cubot/i.test(ua), // I don't know why it's in so many crawler lists
-		)
-		.filter((ua) => !browsersList.includes(ua)) // Remove browsers manually added to browsers.yml
-		.filter((ua = "") => ua.length < 4e3); // Remove very long user agent strings
+	return crawlers.concat(
+		// Filter the downloaded crawlers lists
+		downloaded
+			.flat()
+			.filter((ua) => !ua.startsWith("#")) // Remove comments
+			.filter(
+				(ua = "") => !/ucweb|cubot/i.test(ua), // I don't know why it's in so many crawler lists
+			)
+			.filter((ua) => !browsersList.includes(ua)) // Remove browsers manually added to browsers.yml
+			.filter((ua = "") => ua.length < 4e3), // Remove very long user agent strings
+	);
 }
diff --git a/src/patterns.json b/src/patterns.json
index 1086123..ce9f5b3 100644
--- a/src/patterns.json
+++ b/src/patterns.json
@@ -14,19 +14,16 @@
   "\\[at\\][a-z]",
   "^12345",
   "^<",
-  "^[\\w \\.\\-\\(\\)]+(/v?\\d+(\\.\\d+)?(\\.\\d{1,10})?)?$",
+  "^[\\w \\.\\-\\(?:\\):]+(?:/v?\\d+(\\.\\d+)?(?:\\.\\d{1,10})?)?(?:,|$)",
   "^[^ ]{50,}$",
   "^active",
   "^ad muncher",
   "^amaya",
   "^anglesharp/",
-  "^anonymous",
   "^avsdevicesdk/",
-  "^axios/",
   "^bidtellect/",
   "^biglotron",
   "^btwebclient/",
-  "^castro",
   "^clamav[ /]",
   "^client/",
   "^cobweb/",
@@ -49,7 +46,6 @@
   "^jetty/",
   "^jigsaw",
   "^linkdex",
-  "^lwp[-: ]",
   "^metauri",
   "^microsoft bits",
   "^movabletype",
@@ -70,10 +66,9 @@
   "^svn",
   "^swcd ",
   "^taringa",
-  "^test certificate info",
   "^thumbor/",
   "^tumblr/",
-  "^user-agent:mozilla",
+  "^user-agent:",
   "^valid",
   "^venus/fedoraplanet",
   "^w3c",
@@ -115,7 +110,7 @@
   "firephp",
   "freesafeip",
   "gomezagent",
-  "headlesschrome/",
+  "headless",
   "httrack",
   "hubspot marketing grader",
   "hydra",
@@ -129,7 +124,6 @@
   "mail\\.ru/",
   "manager",
   "monitor",
-  "morningscore/",
   "neustar wpm",
   "nutch",
   "offbyone",
@@ -145,12 +139,15 @@
   "proxy",
   "ptst[ /]\\d",
   "reader",
+  "reputation",
+  "resolver",
+  "retriever",
   "rexx;",
   "rigor",
   "rss",
   "scan",
+  "score",
   "scrape",
-  "serp ?reputation ?management",
   "server",
   "sogou",
   "sparkler/",
@@ -165,14 +162,12 @@
   "torrent",
   "tracemyfile",
   "transcoder",
-  "trendsmapresolver",
   "twingly recon",
   "url",
   "virtuoso",
   "wappalyzer",
   "webglance",
   "webkit2png",
-  "websitemetadataretriever",
   "whatcms/",
   "wordpress",
   "zgrab"